<template>
  <view>
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
          <!-- 左侧的滚动视图区域 -->
          <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
            <block v-for="(item,index) in cateList" :key="index">
              <view :class="['left-scroll-view-item',index === active ? 'active' : '']" @click="activeChange(index)">{{item.cat_name}}</view>
            </block>
          </scroll-view>
          <!-- 右侧的滚动视图区域 -->
          <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
            <view class="cate-lv2" v-for="(item1,index1) in cateLevel2" :key="index1">
              <view class="cate-lv2-title">/{{item1.cat_name}}/</view>
              <view class="cate-lv3-list">
                <view class="cate-lv3-item" v-for="(item2,index2) in item1.children" :key="index2" @click="gotoGoodsList(item2)">
                  <image :src="item2.cat_icon"></image>
                  <text>{{item2.cat_name}}</text>
                </view>
              </view>
            </view>
          </scroll-view>
        </view>
  </view>
</template>

<script>
  import tabbarBadge from '../../mixins/tabbar-badge';
  export default {
    mixins:[tabbarBadge],
    data() {
      return {
        wh:0,
        cateList:[],
        active:0,
        cateLevel2:[],
        scrollTop:0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods:{
      async getCateList(){
        const {data:res} = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
      },
      activeChange(index){
        this.active = index
        this.cateLevel2 = this.cateList[index].children
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      gotoGoodsList(item2){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item2.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  .left-scroll-view{
    width: 120px;
    .left-scroll-view-item{
      background-color: #f7f7f7;
      line-height: 60px;
      font-size: 12px;
      text-align: center;
      &.active{
        background-color: #fff;
        position: relative;
        &::before{
          content: '';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
  .cate-lv2-title{
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  .cate-lv3-list{
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item{
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      width: 33.33%;
      margin-bottom: 10px;
      image{
        width: 60px;
        height: 60px;
      }
      text{
        font-size: 12px;
      }
    }
  }
}
</style>
